<html>
  <!--
		SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
		SPDX-License-Identifier: MIT
	-->
  <head>
    <title>play-from-disk-renegotiation</title>
  </head>

  <body>
    <button onclick="window.addVideo()"> Add Video </button><br />
    <button onclick="window.removeVideo()"> Remove Video </button><br />


    <h3> Video </h3>
    <div id="remoteVideos"></div> <br />

    <h3> Logs </h3>
    <div id="logs"></div>
  </body>

  <script>
    let activeVideos = 0
    let pc = new RTCPeerConnection({
      iceServers: [
        {
          urls: 'stun:stun.l.google.com:19302'
        }
      ]
    })
    pc.ontrack = function (event) {
      var el = document.createElement(event.track.kind)
      el.srcObject = event.streams[0]
      el.autoplay = true
      el.controls = true

      event.track.onmute = function(event) {
        el.parentNode.removeChild(el);
      }

      document.getElementById('remoteVideos').appendChild(el)
    }

    let doSignaling = method => {
      pc.createOffer()
        .then(offer => {
          pc.setLocalDescription(offer)

          return fetch(`/${method}`, {
            method: 'post',
            headers: {
              'Accept': 'application/json, text/plain, */*',
              'Content-Type': 'application/json'
            },
            body: JSON.stringify(offer)
          })
        })
        .then(res => res.json())
        .then(res => pc.setRemoteDescription(res))
        .catch(alert)
    }

    // Create a noop DataChannel. By default PeerConnections do not connect
    // if they have no media tracks or DataChannels
    pc.createDataChannel('noop')
    doSignaling('createPeerConnection')

    window.addVideo = () => {
      if (pc.getTransceivers().length <= activeVideos) {
        pc.addTransceiver('video')
        activeVideos++
      }

      doSignaling('addVideo')
    };

    window.removeVideo = () => {
      doSignaling('removeVideo')
    };
  </script>
</html>
